Exam 4

Question 1

Which of the following displays, ryhymic contractions that are slow to fatigue?

A) Skeletal muscle

B) Multi-unit smooth muscle

C) Visceral smooth muscle

D) Both A and B

E) Both A and C

Answer 1

C) Visceral smooth muscle

Question 2

Which of the following is not a type of fibrous joint?

A) Gomphosis

B) Suture

C) Synchondrosis

D) Syndesmosis

E) All of the above are fibrous

Answer 2

C) Synchondrosis

Question 3

Which of the following components of a synovial joint leads to the production of a synovial fluid?

A) Joint cavity

B) Joint capsule- outer layer

C) Joint capsule- inner lalyer

D) Meniscus

Answer 3

C) Joint Capsule- inner layer

Question 4

Smooth muscle contains the protein ____ but lacks the protein ____.

A) calmodulin; troponin

B) calmodulin; tropomyosin

C) Troponin; calmoduliin

D) Tropomyosin; calmodulin

Answer 4

A) calmodulin; troponin

Question 5

The primary site of calcium storage is the ____ in skeletal muscle, but in smooth muscle, calcium comes from the ____.

A) sarcoplasmic reticulum; transverse tububle

B) sarcoplasmic reticulum; sarcoplasmic reticulum

C) sarcoplasmic reticulum; extra- cellular fluid

D) sarcoplasmic reticulum; sarcolemma

Answer 5

C) sarcoplasmic reticulum; extra- cellular fluid

Question 6

Thin filaments are predominantly composed of ____ protein, while thick filaments are composed of ____ protein.

A) myosin; actin

B) actin; myosin

C) actin; troponin

D) troponin; tropomyosin

Answer 6

B) actin; myosin

Question 7

Which of the following does NOT occur in a muscle during contraction:

A) thick and thin filaments bind to each other

B) muscle fibers stretch

C) thick and thin filaments “ slide” past each other

D) muscle fibers shorten

Answer 7

B) muscle fibers stretch

Question 8

The threshold potential of a skeletal muscle fiber is ____ and the resting membrane potential of a skeletal muscle fiber is ____.

A) -70 mV; -70 mV

B) -70 mV; -55mV

C) -70 mV; -100mV

D) -55 mV; -70 mV

Answer 8

C) -70 mV; -100mV

Question 9

Adduction is defined as:

A) movement of a limb away from the midline

B) movement of a limb towards the midline

C) a decrease in the angle at the joint

D) an increase in the angle at the joint

Answer 9

B) movement of a limb towards the midline

Question 10

Flexion is defined as:

A) movement of a limb away from the midline

B) movement of a limb towards the midline

C) a decrease in the angle at the joint

D) an increase in the angle at the joint

Answer 10

C) a decrease in the angle at the joint

Question 11

Which of the following is true of thin filaments?

A) referred to as myosin

B) found at the H-zone

C) found only at the I-band

D) Referred to as actin

E) Both C and D

Answer 11

D) Referred to as actin

Question 12

Which of the following, found at skeletal muscle, promote the production of ATP?

A) creatine phosphate

B) myoglobin

C) large number of mitochondria

D) all of the above support ATP production

Answer 12

D) all of the above support ATP production

Question 13

Which of the following reinforcing ligament- complex joint pair is incorrect?

A) pubofemoral ligament- hip

B) anular ligament- shoulder

C) Ulnar collateral ligament ( medial)- elbow

D) Anterior cruciate ligament- knee

Answer 13

B) anular ligament- shoulder

Question 14

The A-band is composed of ____ while the I-band is composed of only ____.

A) thin filaments; thick filaments

B) thick filaments; thin filaments

C) both thick and thin filaments; thin filaments

D) thin filaments; both thin and thik filaments

Answer 14

C) both thick and thin filaments; thin filaments

Question 15

Which of the following statements best describe motor units?

A) a weak stimulus leads to a decrease in motor units.

B) A strong stimulus leads to an increase in motor units

C) Motor unit activity allows for variation in force produced by skeletal muscles

D) All of the above decribe motor units

Answer 15

D) All of the above decribe motor units

Question 16

Which follwoing muscle/ muscle group is incorrect?

A) vastus medialis- quadriceps

B) Masseter- mastication

C) Rectus femoris- Hamstring

D) Biceps femoris Hamstring

Answer 16

C) Rectus femoris- Hamstring

Question 17

An increse in the number of motor units in response to a strong stimulus is known as:

A) muscle tone

B) tetany

C) recruitment

D) isometric contraction

Answer 17

C) recruitment

Question 18

Lack of acetylcholinesterase in the synaptic cleft would result in:

A) decrease acetylcholine production by the motor neuron

B) relaxation of the muscle fiber

C) excessive, continuous stimulation of the muscle fiber

D) inability of the motor neuron to stimulate the muscle fiber

Answer 18

C) excessive, continuous stimulation of the muscle fiber

Question 19

Which of the following components of a synovial joint, functions to distribute body weight evely and absorbs shock?

A) Bursae

B) Reinforcing ligaments

C) Menisci

D) Joint cavity

Answer 19

C) Menisci

Question 20

Which of the following is an event associated with muscle relaxation?

A) Increased release of acetylcholing

B) Opening of myosing binding sited on actin

C) Increased calcium permeability at the sarcoplasmic reticum

D) Breakdown of acetylcholinesterase

Answer 20

D) Breakdown of acetylcholinesterase

Question 21

Which of the following describes skeletal muscle fibers?

A) voluntary control

B) Striated

C) Multi-nucleated

D) All of the above

E) None of the above

Answer 21

D) All of the above

Question 22

Which of the following joint type is found at the tibia and fibula?

A) Syndesmosis

B) Synchondrosis

C) Symphysis

D) Gomphosis

Answer 22

A) Syndesmosis

Question 23

Movement of the limb in a circular pattern is known as ____.

A) Extension

B) Flexion

C) Rotation

D) Circumduction

Answer 23

D) Circumduction

Question 24

Which of the following pairs is incorrect?

A) Smooth muscle - mononucleated

B) Skeletal muscle - multinucleated

C) Cardiac muscle - voluntary control

D) Smooth muscle - slow to no fatigue

Answer 24

C) Cardiac muscle - voluntary control